Fire-tube boiler



Sept. 7 1926.: 1,599,169 7 P. C. DYKES' FIR'E TUBE BOILER Filed April 8. 1925 4 Sheets-Sheet 1 I 09 3 I A o MA)? a Sept: 7,1926.

1 1,599,169 P.-C. DYKES FIRE TUBE BOILER Filed April 8. 1925 1 (Sheets-Sheet 2 ,z,y Q WI/LWTUH d? 4 Emmi/7171x275 'Sept. 7,1926.

I 1,599,169 P. C. DYKES FIRE TUBE BOILER Filed April 8. 1925 4 Sheets-Sheet 5 OOOOOOO f/VVZI/VTDE 5 HMWZZEZZE Sept. 7 1926.

P; c. DYKES FIRE TUBE BOILER Filed April s. 1925 4 Sheets-Sheet 4 jvvflvrazz z/227x225 Patented Sept. 7, 192%.

UNITED STATES,

PATENT OFFICE.

PARKER C. DYKES, OF SAN FRANCISQO, CALIFORNIA, ASSIGNOR 'IO IDYKES, INCOR- PORATED, OF SAN FRANCISCO, CALIFORNIA, A CORPORATION OF CALIFORNIA.

' FIRE-TUBE BOILER;

1 6 Application filed April 3; 1925. Serial No. 21,708.

The present invention relates to improvements in steam boilers and has particular reference to the type of steam boiler foruse in connection with motor vehicles and the 6 like. 7

The general object of the invention is to increase the efiiciency of the present type of fire tube boiler by adapting the same to produce superheated steam of a higher temperature than has been heretofore had; to the end that the power efficiency of the motor will be increased because of the resistance to condensation on the part of the high temperature steam Within the cylinder.

The above and other objects are accomplished by instrumentalities pointed out in the following specification. I

The invention is clearly defined in the claims. I

A satisfactory embodiment of the invention is illustrated in the accompanying drawings forming part of the specification and in Which- Y Figure 1 is a sectional plan taken through the upper portion of the jacket and with the steam dome removed.

Figure 2 is a vertical cross section ofthe invention.

Figure 3 is a detail plan with the steam so dome removed .but showing the sectional or intermediate superheater.

Figure 4 is a detail side elevation of the invention.

Figure 5 ure 4t.

Figure 6 is a bottom plan view. Figure? is a detail plan of one of the circulating or generatingtubes.

is a top plan view of Fig- Figure 8 is a side elevation of Figure 7.

Figure 9 is a detail plan of the main superheater.

Figure 10 is a detail vertical cross section takenon the line 10-1O of Figure 9;

looking in the direction of the arrow.

Figure 11 is a View similar to Figure 10, but taken on the line 1111 of Figure 9, looking in the direction of the arrow.

Figure'12 is a detail plan of the intermediate superheater.

Figure 13 is a side elevation of Figure 12, and

Figure 1 1 is adetail side elevation of the";

. coupling between the conduit connecting the water leg and the steam dome.

The device of this invention'consistsessentially of a shell a constituting the body of the boiler, a jacket bsurrounding the shell and formed of heat insulating I material such as an asbestos core 5 disposed between inner and outer plates 6 and 7. The body of the shell a is disposed over a burner constituting a furnace (not shown) 7 which extends into a fire chamber indicated by 8. In the en'ibodiment shown in Figures 1, 2 and 4:, the bulk of the device is such as will permit of the arrangein'ent of the same underneath the hood of a motor vehicle, in which position the device will be supported by a suitable bed frame (not shown) and secured thereto in any well known or preferred manner. The shell a is provided with arelatively large number of lateral and vertical fiues respectively indicated by 9 and 10. These fines place the interior of the shell in communication with the surrounding space 0 underneath the jacket 6, which space 0 communicates with an outlet pipe 11 through which the products of combustion rising from the burner and passing through the fiues and into the space 0 escape into the atmosphere.

The shella includes in .its construction a water leg 12 which extends completely around the shell and around the fiues 9. The top or cover of the shell constitutes a steam dome 13 through which pass the fiues 10. A flange or skirt 14 supports. the dome 13 upon the upper end wall of the water leg 12. Within the shell 64 are disposed two vertical columns d and e of spiral tubes 15. The component tubes of each column are separated one from the other and arranged one above the other as, most clearly shown in Figure '2. The inner ends of the spirals are connected to the lower portion of the water leg 12. This construction isvmost clearly shown in Figures 2 and 6 where it will be are connected in'a common horizontal plane to the lower portion of the water leg 12. As shown in Figure 1, the outer ends of the tubes as indicated by 16 are connected into the water'leg along spaced vertical points disposed inthe horizontal planes of the coils so that the opposite ends of each coil are connected to spaced vertical portions of the waterleg 12. As clearly shown in Figures t and 5, tubular connections 17 extend from noted that the lower ends of the tubes 15- the upper end of the leg into the base of the steam dome 13. 1th this construction,

nects the end portion 21 with a perforated tubular extension 23 which is directed down- Wrardly through the top 2-52 and into the central space of the doine clearly shown in Figures 2, 3 and 5. The inner end portion 26 or the coil 19 is directed downwardly and outwardly and through the flange 14 to the exterior of the shell where it is directed into the lateral port of the casing 25 of the throttle valve. A tubular connection 27 extends from one end of the throttle valve casing The throttle stem 28 which extends into the casing 25 ot the throttle valve operates the valve within the casing to control communication between the tubular portions 26 and 27. The tubular portion 27 is directed inwardly through the flange 14 and into a vertically disposed chamber 28 extending vertically downward through one side of the space between the columns d and e and into the fire box 8. A tubular conduit 29 "forms an extension of tube 27 and is disposed within the chamber 28 and is proportioned with respect to thechamber'28 so that an annular passage 30 is provided within the chamber, which passage extends by virtue of the length of the conduit- 29 to a point adjacent to the lower end of the chamber. A tubu lar extension 31 extends into the upper end of a chamber 32 which is disposed adjacent to the chamber 28. A tubular inlet 32 is connected to the extension 31 and extends to the lower end portion of chamber 32. A coupling 33 extends diagonally across the space between the columns (5 and e to the opposite side of the shell, at which point it enters a chamber 33 similar to chamber 28 and in which is disposed an inlet tube 34 similar to the tube. 29. The tube 34 extends to the lower end portion of the chamber 33 and is connected at its upper end to the extension 33. Tiis tube operates to provide an annular passage similar to the passages.

described in connection with chambers 28 and 31. An outlet tube 35 extends from the upper end portion of chamber 33 into. an adjacent chamber 36 which extends together with the chamber 3; downwardly and into the fire box 8. The interior of the chamber 36corresponds to chamber 31. The'outlet tube 37 which corresponds to outlet tube 32 extends outwardly and through the shell and to the steam motor. From the foregoing it is clear that the chambers 28, 31, 33 and 36 by virtue of their construction and arrangement operate as superheatcrs In the use of the device the height of the water column in the water leg 12 will correspond approximately to one-half the height of the said water leg so that the tubes disposed below the level of the water column will function as circulating tubes, while those above will act as generating tubes. hen steam is generated in either of the columns (Z and c it passes through the .generating tubes and then into the water leg 12. At this time the steam is saturated. From the water leg 12 the steam passes through the tubularconnections 17 and into the dome 13 where its temperature, is raised by the heat of the chamber had from exposure of the base 20 thereof to the heat of the furnace. From the dome 13 the steam passes through the perforatedextension 23, connection 22 and extension 21 into the evolutecoil 18 of the secondor intermediate superieater. On account of the location ofthe said intermediate superheater, the temperature or" the steam is increased beyond the temperature received in the dome 13. OW- ing to the construction ofthe coils 18 and 19, considerable time is required for the steam to pass through the said coils and finally to the throttle valve. .When the last named member is opened, the steam passes through the extension 26 into the extension 27 and into the first chamber 28. By virtue ill;

of the tube 29 the steam is conveyed downwardly and to the hottest portion of chamber 28 from which it rises through the an nular space 30 and passes through the ex-.

tension 31 and into the chamber 33 through the inlet tube 32.

In that the construction of chamber 32 corresponds with that of chamber 28, the steam is required to follow a corresponding course until it emerges through the coupling 33 which conveys the steam to the chamber 33 from which the steam passes into the chamber 36 and then into the main steam pipe 37 and then to the motor, not shown. Thus it is seen that upon opening the throttle, the superheated steam from the intermediate superheater made up of the coils 18 and 19 is subjected to a further superheating before leaving the boiler- The'final super-' on its way to the motor. heating step accomplished by the chambers 28, 32,33 and 36 increases-the temperature of the steam to the maximum within the heating limit of the furnaceorburner with: in the fire box, and this because of the construction and location of the said chambers. Thus it will be seen that the steam upon moving through the main-steam pipe 37 is thoroughly dried and at a temperature that will the upper end of the water leg 13. In this leg. The fitting is connection the outer end portion of each of the tubes 17 is directed into an angular coupling 38 which has a tapered lower end portion 39 directed into a correspondingly shaped opening in a piece of relatively soft metal 40, such as brass, which is first inserted into an opening in theupper end wall 41 of the water leg and then expanded so as to interlock with the screw threaded wall of the opening.

tight. joint is had in that under the action of heat the soft metal 40 will tend to expand V to a greaterextent than the'relatively hard steel forming the top wall 41 of the water locked by a tapered screw 42 which is screwed into a correspondingly shaped opening in the top wall 31 and passes through an opening in the lateral extension 43 on the body of the fitting -which is clamped by a nut 44 which is screwed upon the screw 42. v 7

Referring now to Figure 1, itwill be noted that spreaders 415 are disposed within the columns d and e for the purpose of deflecting and spreading the flame of the furnace laterally around the tubes 15.

In this way an effective Although I have shown and described an ideal embodiment of'my invention, I wish" to have it understood that the same is susceptible of certain changes, and I reserve the right to employ such as may come Wlthin the scope of the appended claims.

I claim: v Y

1. In a fire tube boiler, a shell, 'a vertical water leg arranged within the shell, a steam dome forming a closure for one end of the shell, a column tubes disposed within the shell and above the fire box and connected to the waterleg and. the steam dome, a superheating coil disposed between the column and the steam dome and-a steam chamber extending downconnected wardly' and into the firebox and to the superheating coil.

7 2. In a fire tube boiler, a shell, a vertical water leg arranged .within the shell, a steam dome forming a closure for one end of the shell, a column comprising a plurality of tubes disposed within theshell and above the fire box and connected to the water leg and the comprising a plurality of,

steam dome, a superheating coil disposed between the column and the" steam dome, a plurality of steam chambers extending downwardly into the fire box and connected one to the other, and a valve controlled connection between the-said steam chambers and the superheating coil.' p

U PARKER C. DYKES. 

